1  You should run this program as its't command:   ./flash TIME  MESSAGE       there are 3 parameters in it's command line: A:flash; B:TIME(like"2");     C:print message(as "Flash Message")     eg: ./flash  2 "Flash Message" 2  You can change the flash time through the command "Set the new flashtime:"    Input the new flash time and press ENTER,the program will continue to flash.3  You can terminate the program by<ctrl>C to termination this window,and you   can get the "Exit this program" message before shutdown this window.